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Microporous composite brake pad for high-speed railway and manufacturing method of microporous composite brake pad

A technology for high-speed railways and manufacturing methods, applied to friction linings, mechanical equipment, etc., can solve the problems of brake disc thermal cracks, long production cycle, expensive price, etc., and achieve the reduction of friction surface temperature, short production cycle, and heat dissipation effect Good results

Inactive Publication Date: 2012-07-25
SHANGHAI RENPHEN COMPOSITE MARERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the immaturity of the technology, the long production cycle (such as the production cycle of C / C composite materials is as long as 3 months) and the high price, it has not been commercialized.
Two companies engaged in the research and development of brake pads in my country use powder metallurgy brake pads and ceramic brake pads respectively, but because the materials are too hard and the flash point temperature is too high, thermal cracks occur in the brake discs, so the effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for manufacturing a microporous composite brake pad for high-speed railways, comprising the following steps:

[0035] (1) Preparation of raw materials:

[0036] Component Weight percent

[0037] Polyimide modified resin 10%

[0038] Friction modifier 12%

[0039] Precipitated barium sulfate 20%

[0040] Graphite 25%

[0041] Aramid pulp 1%

[0042] Chopped carbon fiber 20%

[0043] Zinc Oxide 12%,

[0044] Among them, the friction modifier is vulcanizing agent PDM.

[0045] (2) Preparation:

[0046] The above-mentioned raw materials are added to the high-speed rake mixer in proportion and mixed step by step. The mixing time is 3 minutes. The material is reacted in the molding mold with a pressure of 250kg / cm2 for 400 seconds at 50°C. The formed brake disc is then sintered at high temperature. The sintering temperature is 160° C., and the sintering time is 16 hours to obtain a microporous high-porosity brake sheet.

Embodiment 2

[0048] A method for manufacturing a microporous composite brake pad for high-speed railways, comprising the following steps:

[0049] (1) Preparation of raw materials:

[0050] Component Weight percent

[0051] Silicone modified resin 13%

[0052] Friction modifier 15%

[0053] Precipitated Barium Sulfate 25%

[0054] Graphite 27%

[0055] Aramid pulp 1.5%

[0056] Chopped carbon fiber 15%

[0057] Zinc Oxide 3.5%,

[0058] The friction modifier is organic bentonite.

[0059] (2) Preparation:

[0060] The above-mentioned raw materials are added to the high-speed rake mixer in proportion and mixed step by step. The mixing time is 4 minutes. The material is reacted in the molding mold at a pressure of 270kg / cm2 for 400 seconds at 80°C. The formed brake disc is then sintered at high temperature. The sintering temperature is 200° C., and the sintering time is 16 hours, and the microporous high-porosity brake sheet can be obtained.

Embodiment 3

[0062] A method for manufacturing a microporous composite brake pad for high-speed railways, comprising the following steps:

[0063] (1) Preparation of raw materials:

[0064] Component Weight percent

[0065] Cashew shell liquid modified resin 15%

[0066] Friction modifier 8%

[0067] Precipitated barium sulfate 30%

[0068] Graphite 30%

[0069] Aramid pulp 2%

[0070] Chopped Carbon Fiber 10%

[0071] Zinc Oxide 5%,

[0072] Wherein the friction modifier is kaolin.

[0073] (2) Preparation:

[0074] The above-mentioned raw materials are added to the high-speed rake mixer in proportion and mixed step by step. The mixing time is 5 minutes. The material is reacted in the molding mold at a pressure of 350kg / cm2 for 400 seconds at room temperature to 100°C. The formed brake disc is then sintered at high temperature. The sintering temperature is 160° C., and the sintering time is 12 hours, and the microporous high-porosity brake sheet can be obtained.

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Abstract

The invention relates to a microporous composite brake pad for a high-speed railway and a manufacturing method of the microporous composite brake pad. The microporous composite brake pad for the high-speed railway comprises the following compositions by weight percentage: 10-15 percent of modified resin, 8-15 percent of friction performance moderator, 20-40 percent of precipitated barium sulfate, 25-35 percent of graphite, 0.5-5 percent of aramid pulp, 10-20 percent of short carbon fiber, and 1-15 percent of zinc oxide. The raw materials are added into a high speed rake mixing machine to be mixed, and then the obtained mixed materials are placed in a molding die to be molded and then sintered to obtain the microporous composite brake pad. Compared with the prior art, though the microporous composite brake pad, the problems that in a domestic motor train unit brake pad, cracks, hot marks, black smoke and metal inlay are caused by a high-speed braked thermal load to affect the traffic safety, and the like can be solved, the microporous composite brake pad plays a role of protecting a couple material at a certain extent, the production cycle is short, and the production efficiency is high.

Description

technical field [0001] The invention relates to a composite brake pad and a manufacturing method thereof, in particular to a microporous composite brake pad for high-speed railways and a manufacturing method thereof. Background technique [0002] Most parts of high-speed trains, namely EMUs, rely on imports, especially brake materials that are both safety parts and vulnerable parts. Although the domestic manufacturers of EMU brake pads below 250km / h have passed the bench test and are in the process of loading test; but the EMU brake pads above 300km / h are blank at present and completely rely on imports. The main problem at present is that the entire brake friction pair (brake disc and brake pad) is too poor to withstand the impact of thermal load. Even if the brake pad can withstand the thermal load impact of high-speed braking, the brake disc will also be Fatal injuries such as hot cracks and other fatal injuries that affect driving safety due to excessive load. [0003] ...

Claims

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Application Information

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IPC IPC(8): C08L61/14C08K13/04C08K7/06C08K3/30C08K3/04C08K3/22F16D69/02B29C43/58B29C67/04
Inventor 张定权
Owner SHANGHAI RENPHEN COMPOSITE MARERIALS
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